can you warm these bottles in the microwave?

Warming up milk in the microwave is not just dangerous because of heat pockets. It is also the case that it changes the structure of the milk, so it is not as good or natural for your baby anymore. Don't consider microwaving any milk!

Will these bottles work with a Spectra S2 pump?

I have the 4oz bottles and the Spectra pump S1. You will need an adapter (https://smile.amazon.com/gp/product/B01A4LUZA4) to attach to the Spectra since these are narrow mouth bottles. I've found the combination works well with the adapter but be warned that the 4oz bottles are heavy so, depending on your use case, the 9oz ones could easily be too heavy to use with a pump.

Do you guys use these for breastmilk storage as well? wondering if i need to get both. if so, i'd like to get reusable storage bottles/bags.

I don't use them to store breastmilk because it would be to costly. But they can be frozen so if you are freezing the milk it will work. We v only have two bottles so I use the medela storage bottles when pumping and storing milk. I wish life factory sold glass bottles without sleeves for storage.

Product Dimensions	6 x 8.75 x 3 inches
Item model number	LF110015C4
Is Discontinued By Manufacturer	No
Target gender	Unisex
Material Type	glass
Material Composition	Glass, Silicone
Material free	BPA Free
Care instructions	Dishwasher safe (place cap parts and nipple on top rack/no need to remove silicone sleeve unless desired)
Number Of Items	1
Batteries required	No
Dishwasher safe	Yes
Bottle nipple type	Vented
Bottle type	Standard Bottle
Item Weight	6.6 ounces

LifefactoryGlass Baby Bottle with Stage 1 Nipple and Protective Silicone Sleeve Blanket 4 Oz

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